Spark plug



- l. W. GLEASON.

SPARK PLUG.

APPLICATION FILED FEB.19,I920.

1,436,760, Patented Nov. 28, 1922.

III)" Patented Nov. 28, 1922.

PATENT OFFICE.

101m w. snmson, or m, new YORK.

srmx 1mm.

Application filed I'ebruu'ry To all m 7mm. it may concern:

Be it known that I, Joan W. Gmuusou, a citizen of the United States,residing at Schenectady. in the county of Schenectady and State of NewYork, have invented oertain new and useful lmfirovements in Spark Plugs,of which the fol owing is espeo fiosfi tion This invention relates to;improvements. in

spark plugs.

An important object of this invention'is to preside n' spark plug havinge novel form of intensifier urrangedpwithiuthe shell of the same and adsed for increasingthe intensit oithe spar at the sparking point of theplu so as to assure oomplete combustion of its fuel 'mixture within thecylinder. of. the motor to which :the spark-plug is attached. T

' A further objeet ofthe' invention-ism provide a spark plug hiwing alninsulator formed of upper and lower spaeedsections between which isarranged an intensifierenclosed in an airtight chamber so that thecurrent in making the gap in-the intensifier will not be subjected to(letrimentul air currents.

-A further object of this invention is to "provide a spark plugl havinguppernnd low or insulator sections; the lower insulator sec tion beingsubstantially in the form of asphere so that the same will expend-andeontvuot equally in all directions.

A further object of the invention is to provide a spark plug wherein;the stationary electrode of the sumehas its free-endportions widened andflattened tola thln ed so as to increase theeifieieneyof the span uponmakingthefinnlgap.

A further ob'ect of this invention is -to provide nspark' lugwhich-maybe readily taken apart for t e purpose ofuelenmng. the some.Further objects and advantages of: the invention will henpareut'duriugthe' course of-the following esqription. v In theaceompan'ym drawing part of this epplicetion and- .m which:

' numerals are emgloyed to designate like parts throughout-t e slune.

Figure .1 is a. vertical section-through a spn-rk plug embodylngtheinvention Figure-'2 is a grouprperspeotive; i themsulator and theintensifier embod ed. mthe 19, mo. semi No. new.

Figure 3 is a fragmentary perspective of the spark plug.

Inthe drawing wherein for the purpose of illustration is shown apreferred embodiment of the invent-ion, the numeral 5' generallydesignates one cylinder ofan internal v combustion engine provided, asillustrated in l igurel, with the usual openin for receivmg e spar'kplug; The improve spark plug formmg vthe subject matter of thisinvention 15 provided with a shell 6 having its lower portionexterior-1y screw-threaded, as indigated at 7, so that-the same 'me hethreaded into the spark plug opening 0 the cylinder. Theupper ortion ofthe cylindrical shell 6 ls-polyg'onn sidedlasrindieated at 8, so as toform a gripping surface for a, wrench where- Ey thedplug may be appliedendremoved, as eslre A substantially spherieal insulator 9 of 7' intognsdiigbt engagement with the annular shoulder 10 and-the adjacentportion of the shell by a nipple v14 which isthreaded into the upperportion of the shell 8. "By this construction the substantiaillyspherical insulator 9 is but detachubly .held withinnthe shell and isallowed to evenly and uniformly expand and contract as the result oftheheat rediated the motor.

.Aa partieulsrlj' illustrated-in Figure 1, the upper irisulfltorl'fiispartly arranged wvithin themp I end is limite in its "downward movementby an interiorly arrsnged annular shoulder 16 having an annular gasket17 mounted thereon for providing :a gasstight connectionbetyreenthe'upperinsulator-15nd the rtion of-the nipple 14 r nipple."The. upper insulatoris held in contact with the-adj eeent-portion-ofthe. mp-

ple' a ferrule or looking p18 having thre eden nt, with the up r .por-'tion (lithe-n1 e endprovided w an inwardly ex -mnulerfflimge 19 having'oontact with-the upper end of the insulator 15. The u per-insulator isthus seeurelyaattlohed to "1 4;

any of the parts which may become broken as the result of continued useor an accident.

Further, the improved spark plug in manufacture is not appreciablylarger than the spark plug now generally in use and will not thereforebe rendered difiicult to apply or remove.

It is to be understood that the form of the invention herewith shown anddescribed is to be taken as a preferred embodiment of the same and thatsuch minor changes in construction and arrangement of parts may be madeas will remain within the spirit of the invention and the scope of whatis claimed.

Having thus described the invention, what is claimed as new is:

1. A spark plug including a shell, an insulator arranged within thesame, a cylindrical nipple threaded into the upper portion of the shelland securing said insulator in position, a second insulator secured tothe upper portion of said nipple, upper and lower conductors carried bysaid first and second named insulators and having their adjacent endsarranged in spaced relation, a cylindrical member confined, between theopposed sides of said first and second named insulators and having alongitudinally extending bore, said cylindrical member being arranged inspaced relation to the sides of said nipple for forming an outer annularchamber, and contact elements arranged within the bore of saidcylindrical member.

2. A spark plug including a shell, a lower insulator arranged within thesame, an upper insulator arranged in spaced relation to said first namedinsulator, a metallic disk mounted upon the lower insulator and having acentrally arranged head, a conductor extending through said lowerinsulator and engaged with the head of said disk, an inter mediateinsulator confined between the first and second named insulators andhaving one end engaged with said disk, and contact elements arrangedwithin said intermediate insulator.

3. A spark plug including a shell, an insulator arranged within theshell, a nipple threaded into the shell for securing. the insulator inposition, an upper insulator having its lower portion secured Within theupper portion of said nipple, a ferrule threaded onto the upper portionof the nipple and having an inwardly extending flange in contact withthe upper side of said upper insulator, a terminal post extendingthrough the upper insulator and terminating at the in ner end of thesame, an intermediate insulater of cylindrical formation arrangedbetween the first and second named insulators, a metallic disk mountedupon the upper end of the first named insulator and having a centrallyarranged hollow head, a pair of contact elements arranged within saidintermediate insulator and having electrical contact with the centrallyarranged head of said disk, one of said elements being arranged inspaced relation to the inner end of said terminal post, saidintermediate insulator being spaced inwardly from the sides of saidnipple for providing an annular air chamber whereby a uniformtemperature is maintained within said inter mediate insulator, and anelectrode carried by the first named insulator and having its upper endsnugly arranged within the centrally arranged head of said disk.

In testimony whereof I afiix my signature.

JOHN W. GLEASON. [1,. 5.]

